package test.ch2en;
import java.io.UnsupportedEncodingException;

/** */  
  
/**  
 * 取得给定汉字串的首字母串,即声母串  
 * <p>Title: ChineseCharToEn</p>  
 * <p>@author javer QQ:84831612</p>  
 *  
 * @version 1.0  
 * @date 2004-02-19  
 * 注：只支持GB2312字符集中的汉字  
 */  
public final class ChineseCharToEn {   
    private final static int[] li_SecPosValue =   
            {   
                    1601, 1637, 1833, 2078, 2274, 2302, 2433, 2594, 2787, 3106, 3212, 3472,   
                    3635, 3722, 3730, 3858, 4027, 4086, 4390, 4558, 4684, 4925, 5249, 5590  
            };   
    private final static String[] lc_FirstLetter =   
            {   
                    "a", "b", "c", "d", "e", "f", "g", "h", "j", "k", "l", "m", "n", "o", "p",   
                    "q", "r", "s", "t", "w", "x", "y", "z"  
            };   
  
/** */  
    /**  
     * 取得给定汉字串的首字母串,即声母串  
     *  
     * @param str 给定汉字串  
     * @return 声母串  
     */  
    public String getAllFirstLetter(String str) {   
        if (str == null || str.trim().length() == 0) {   
            return "";   
        }   
  
        String _str = "";   
        for (int i = 0; i < str.length(); i++) {   
            _str = _str + this.getFirstLetter(str.substring(i, i + 1));   
        }   
  
        return _str;   
    }   
  
/** */  
    /**  
     * 取得给定汉字的首字母,即声母  
     *  
     * @param chinese 给定的汉字  
     * @return 给定汉字的声母  
     */  
    public String getFirstLetter(String chinese) {   
        if (chinese == null || chinese.trim().length() == 0) {   
            return "";   
        }   
        chinese = this.conversionStr(chinese, "GBK", "ISO8859-1");   
  
        if (chinese.length() > 1) //判断是不是汉字   
        {   
            int li_SectorCode = (int) chinese.charAt(0); //汉字区码   
            int li_PositionCode = (int) chinese.charAt(1); //汉字位码   
            li_SectorCode = li_SectorCode - 160;   
            li_PositionCode = li_PositionCode - 160;   
            int li_SecPosCode = li_SectorCode * 100 + li_PositionCode; //汉字区位码   
            if (li_SecPosCode > 1600 && li_SecPosCode < 5590) {   
                for (int i = 0; i < 23; i++) {   
                    if (li_SecPosCode >= li_SecPosValue[i] &&   
                            li_SecPosCode < li_SecPosValue[i + 1]) {   
                        chinese = lc_FirstLetter[i];   
                        break;   
                    }   
                }   
            } else //非汉字字符,如图形符号或ASCII码   
            {   
                chinese = this.conversionStr(chinese, "ISO8859-1", "GBK");   
                chinese = chinese.substring(0, 1);   
            }   
        }   
  
        return chinese;   
    }   
  
/** */  
    /**  
     * 字符串编码转换  
     *  
     * @param str           要转换编码的字符串  
     * @param charsetName   原来的编码  
     * @param toCharsetName 转换后的编码  
     * @return 经过编码转换后的字符串  
     */  
    private String conversionStr(String str, String charsetName, String toCharsetName) {   
        try {   
            str = new String(str.getBytes(charsetName), toCharsetName);   
        }   
        catch (UnsupportedEncodingException ex) {   
            System.out.println("字符串编码转换异常：" + ex.getMessage());   
        } 
        return str;   
    }   
  
    public static void main(String[] args) {   
        ChineseCharToEn cte = new ChineseCharToEn();   
        System.out.println("'夜未眠'的首个拼音字母是：" + cte.getFirstLetter("夜未眠"));   
        System.out.println("'Javer夜未眠'的首个拼音字母是：" + cte.getFirstLetter("Javer夜未眠"));   
        System.out.println("'期望值为供销社'的全部字母的拼音字母是：" + cte.getAllFirstLetter("期望值为供销社"));   
    }   
}  
